Once you open a can of Pringles chips they should last for a month or two as long as you keep the lid on the Pringles can.
That's a good thing about Pringles Chips and the can they come in.
Unlike bag potato chips the Pringles can has a lid that you can snap back on the Pringles can to keep the Pringles chips from going stale as fast.
So when you're done eating some Pringles Chips you can just snap the lid back on and it will last for up to a month or two before going stale.
However most people including myself can consume a can of Pringles in a day or less.
Sometimes I can just open a can of Pringles chips and have them eaten within 30 minutes while just sitting and watching TV or while on the computer.
Pringles chips are so good that most people cannot make them last longer than a day.